I've been trying to install this software called Aperture Photometry Tool, even though I follow their instructions I can't get it working. I tried to contact them but I haven't gotten a reply yet (after 3 weeks of waiting). I therefore wonder if you might be able to help me out. The instructions to the installations I've been following can be found below:

Now, you need to set up your environment. If your default shell is bash, add these lines to your .bash_profile file (or change from 2.3.1 to 2.3.2 if you installed the previous version of APT):

export APT_HOME=/Applications/APT_v2.3.2 export PATH=$APT_HOME:$PATH export APT_ARCH=MAC (omit if a Mac is not the target machine)-------------------------------------------------------------------------------------

When I later try to run ./APT.csh while in the directory /home/robin/Applications/APT_v2.3.3. I get "APT_ARCH: Undefined variable."Why is that? When I go to my .bash_profile file I have added the two lines (see above). I've been told that I edit the .bash_profile file in "/home/robin" with the command sudo gedit .bash_profile. Is this correct? Thanks in advance.

Note that the version I've been installing is APT_v2.3.3 and not APT_v2.3.2 as the instructions above are from. But this is easily modified of course in the export lines.